Online Model‐Based Process Safety Concepts in Polymerization

Manders, L.G.; Meister, Martin; Bausa, Jens; Hungenberg, Klaus‐Dieter

doi:10.1002/masy.201000049

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Falhas no sistema de refrigeração do reator podem ocorrer causando um aumento da temperatura interna. Esta elevação da temperatura causará o aumento da pressão de vapor do meio, favorecendo reações secundárias e gerando ainda como subprodutos gases não condensáveis, podendo acarretar em uma reação em cadeia descontrolada e possíveis rupturas do reator e/ou seus acessórios (MANDERS et al, 2011).…”

Section: Segurança De Processosunclassified

Simulação da copolimerização de estireno-butadieno em reator semi-contínuo

Camargo¹

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The emulsion polymerization process is a very important process to the industry in the production of polymers with a wide range of applications. There is a large industrial interest to obtain higher solid content polymers in order to optimize the reactor capacity with the same time of reaction, reducing the storage area and transportation to the final costumer. However, to obtain polymers with high solid contents, the difficulties with the stabilization of the emulsion, the higher viscosity and formation of residues (clots) generate limitations in the process, interfering in the safety of reaction. To this paperwork was chosen the styrene-butadiene emulsion copolymerization because of their industrial importance as well as the relevant properties for industrial safety aspects. The objective was to study the influences of the increased solids content in the properties of the styrene butadiene emulsion in a semi-continuous process that affect the safety of the emulsion copolymerization reaction. First of all, was found in the literature a model already validated to the styrene butadiene emulsion copolymerization in a semi-continuous process. This model was used as a base to perform simulations in the Aspen Polymers® software in order to examine the exothermic properties and the behavior of the emulsion. The solid content in the styrene-butadiene emulsion was increased gradually reducing the water of the formulation and maintaining proportionality between the other raw materials ranged from the original 48.4 % to 65.1 % where all water from the pre-emulsion was removed.The final properties of the emulsion had expected results as discussed on theoretical basis: the specific mass, viscosity, molecular weight and particle diameter enlarged with the increasing of solid content and polidispersity, the glass transition temperature, the specific heat and the thermal conductivity decreased. The reaction heat removal rate and the reaction temperature under adiabatic conditions in scenarios of possible runaway reaction were considered for the safety of the process, increasing significantly with the rise of solid content and indicating the presence of unreacted monomers at the end of the reaction time of 10 hours. The analysis of the sensitivity of xviii the model was performed by changing the processing temperature of the final product in different concentrations in order to increase the reaction yield. For each change made, variations of product properties were analyzed in detail to verify changes in the final product. The best working point found in this study was 60 % of solids content at 78°C reaction temperature. The results demonstrated that small changes in process may be sufficient to ensure the safety of the process and the quality of the final product with high yields.

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Section: Segurança De Processosunclassified